#!/usr/bin/env python
# coding: utf-8

# 对于给定字符串`x`与`y`，将字符串中的所有字符大写
# 
# 输入：两个字符串`x = "Hello world"``y = "Practice makes perfect"`
# 
# 要求：分别在两行中按顺序打印大写后的`x`与`y`
# 
# 预期输出：
# + 第一行：`HELLO WORLD`
# + 第二行：`PRACTICE MAKES PERFECT`

# In[4]:


x = "Hello world"
y = "Practice makes perfect"

lst = []
lst.append(x.upper())
lst.append(y.upper())

for line in lst:
    print(line)

